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Mathematics
Problem
Show that the area of the triangle formed by the positive X-axis, the normal and tangent to the circle
x
2
+
y
2
=
4
x^2 + y^2 = 4
x
2
+
y
2
=
4
at
(
1
,
3
)
(1, \sqrt{3})
(
1
,
3
)
is
2
3
2\sqrt{3}
2
3
.
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